[QUESTION] is it possible / easy to add a klein application to an existing twisted.application.service.Application?

[michelcrypt4d4mus]

Apologies if this is the wrong place to ask this but is it possible / easy to add a klein application to an existing Twisted app launched via a .tac file? I found this part of the docs which explain how to implement a klein app and launch it via twistd -n web so it seems like it should be possible to do what i describe - create a klein resource and add it to the Application via setServiceParent() - but I'm unclear as to how to proceed given that the documentation example assumes that klein is the entire application whereas my use case requires me to manage other resources listening on other ports.

thanks.

[michelcrypt4d4mus]

managed to work this one out far more easily than i expected... for future searchers:

klein_server.py

from klein import resource, route
from twisted.application import internet
from twisted.web.server import Site


@route('/')
def hello(request):
    return "Hello, world!"


def getService():
    return internet.TCPServer(7757, Site(resource()), interface='')

app.tac

from klein_server import get_service

application = service.Application(f"illmaticized")
getService().setServiceParent(application)

Run with twistd -noy app.tac.

[glyph]

Awesome, glad you were able to quickly figure this out. Is there still a doc issue here though, where it could have been made clearer, so you wouldn't have gotten stuck in the first place?

[michelcrypt4d4mus]

it definitely wasn't super clear. i was able to figure it out by looking at the run() method and seeing how the Site object wraps a call to resource() much the same as some twisted code i was already working with.

didn't seem well documented (or maybe I missed it) that you can launch a standalone klein server outside of the twistd CLI tool or the klein runner by calling internet.TCPServer(7757, Site(resource()), interface='').

maybe a line in the page of the docs i linked pointing that out might prove fruitful for someone else in the future.

[glyph]

@michelcrypt4d4mus I filed #757 to try to add something to the documentation so others don't experience this as badly.